The protonated layered perovskite oxide H1.9K0.3La0.5Bi0.1Ta2O7 (HKLBT) was prepared from K0.5La0.5Bi2Ta2O9 (KLBT) by H ion-exchange, and subsequently characterized by thermogravimetric analysis (TG-DSC), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The effects of the calcining temperature on the material's photocatalytic activity were also investigated. Results showed that HKLBT with high crystalline quality could be synthesized at low temperatures and that HKLBT prepared from KLBT calcined at 900℃ exhibited the greatest photocatalytic activity, with an average water splitting hydrogen evolution rate of 236.6 μmol·h-1 in pure water. The time course of water splitting indicated HKLBT has ability to split water into hydrogen and oxygen with long-term stability.